Thomas baebee



(No Model.)

T. BARBER.

PISTON PACKING.

No. 313,704. Patentd Mar. 10, 1885.

WITNBSSES= INVENTOR Bgrtc'wwwa B cwbgv ATTORNEYS Await rrica THOMAS BARBER, OF FLATBUSH, NEW YORK.

PlSTON-PACKBNG.

SPECIFICATION forming part of Letters Patent No. 313,704, dated March 10, 1885.

Application filed October 30, IP84. (No model.)

spring situated between the expanding cone and the piston and acting on the expanding cone, and a packing surrounding the expanding ring.

In the accompanying drawings, Figure 1 is a vertical section in the plane or m, Fig. 2.

Fi 2 is a vertical section in the lane 1 1 Fig. 1.

Similar letters indicate corresponding parts.

In the drawings, the letter A designates a part of a steam'cylinder which incloses a piston, B, witha follower, O. The annularspace between the piston and the follower is occupied by an expanding ring, D, composed of a number of wedge-shaped sections, a. The inner side ofeach of these sections a is concave, and is provided with a transverse groove, 2), through which passes a pin, 0. \Vhen the sections are brought together to form the expanding ring, the concave inner sides form part of a cone and the grooves a form a concentric annular groove.

The sections forming the expanding ring D are exposed to the act-ion of a spring, d, fitted into the annular groove b, and held in place by the pins 0, behind which it passes. The force of the spring tends to draw the sections together. To prevent the sections from sliding out from the spring, the ends of the spring are bent over to form hooks e of such a size as not to interfere with the subsequent removal of any of the sections a.

Into the expanding ring projects an expanding cone, E, of the same taper as said expanding ring, which is provided with an annular recess, f, corresponding in position to another annular recess, formed in the piston B. The expanding cone is exposed to the action of a spiral spring, I, situated be tween the same and the piston, the ends of the spring fittingin the recesses fg, thus keep ing the same in position.

'When the sections forming the expanding ring D are together, as shown in the drawings, it does not come flush with the outer circumference of the piston B, but an annular space. is left, which space is occupied by hemp or similar packing, I-Lor else the usual steel packing or piston-rings may be used. G is the piston-rod passing through the piston and follower, and secured by means of a nut, h,- or it may be secured in any other suitable manner.

It is evident the spring F, acting on expanding cone E, continually tends to force the same down into the expanding ring D, theresult of which is a tendency to spread the ex panding ring and force the packing H against the walls of-the cylinder. The spring d, acting inward, serves to keep the expanding ring D constantly pressed against the expanding same, the expanding cone E, which projects,

into the expanding ring, the spring F, situated between the expanding cone and the piston, and acting upon the expanding cone, and

the packing H on the expanding ring.

In testimony whereof I have hereunto set' my hand and seal in the presence of two subscribing witnesses.

THOMAS BARBER. [L. s.] \Vitnesses:

A. FABER DU FAUR, J r., E. F. KASTENHUBER. 

